Melissa K. Walton-Shirley, MD

Medicare activity in 2024

Official CMS public-use data for Melissa K. Walton-Shirley, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Most frequent services

1. Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)58 services
2. Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)36 services
3. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)25 services
4. Ultrasound of heart, follow-up (93308)22 services
5. Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)20 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

• High blood pressure75%
• High cholesterol75%
• Ischemic heart disease55%
• Heart failure47%
• Arthritis45%
• Atrial fibrillation44%

Hospitals where Melissa K. Walton-Shirley works

Medicare's Facility Affiliation Data lists Melissa K. Walton-Shirley at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

• Holy Rosary HospitalMiles City, MT · Critical Access Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 271347
• Intermountain Health St Vincent Regional HospitalBillings, MT · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 270049

Practice locations

Addresses where Melissa K. Walton-Shirley is enrolled with Medicare (CMS data updated October 2, 2026).

• 2900 12th Ave N, Suite 204eBillings, MT 59101 (406) 237‑5001

Group practices

Medicare enrollment lists Melissa K. Walton-Shirley as a member of this group (CMS data updated October 2, 2026).

• SCL Health Medical Group - Billings LLC297 clinicians in the group

Specialties

• Cardiovascular Disease (Cardiology)primary

Find other Cardiovascular Disease (Cardiology) doctors in Montana →

Other cardiologists in Billings

Clinicians with the same Medicare primary specialty in Billings, MT — not a recommendation.

• Larry G. Ferachi, MD
• Christopher M. Anzalone, DO
• Robert T. Terry, MD
• Josef Stehlik, MD
• Joseph C. Apostol, MD
• Barbara S. Dudczak, MD
• Pyi Phyo Aung, MD
• James Sensecqua, MD

All cardiologists in Billings →

Other clinicians in SCL Health Medical Group - Billings LLC

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Keri L. Hill, MD
• Alyssa M. Seidel
• Jacqueline F. Barton, NP
• Samuel J. Reck, MD
• Dekrisha Lew, MD
• Kyle R. Brekke, DO

Clinician information

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians